Herbicide resistant weeds are a real problem for Ontario farmers and a growing nuisance to Western Canadian farmers. Right now, there are more than 60 herbicide resistant biotypes in Canada.
Map adapted from Hugh Beckie’s “State of weed resistance in Western Canada and future outlook” presentation at the Herbicide Resistance Summit in Saskatoon, Saskatchewan, on Mar. 2, 2016.
With the new research that’s out there, we now know that we can’t simply rotate herbicides every year and hope to slow the spread of resistance – we need to mix our herbicide modes of action at least once a year.
Beckie’s 2009 study on herbicide use and the development of herbicide-resistant weeds
|Resistant seed produced per square meter averaged over 4 years||Percent of weed seed in soil that was resistant after 4 years|
|Never used ALS herbicide||155||4|
|Used ALS herbicide once over 4 years||1210||29|
|Used ALS herbicide every year, mixed with 2nd herbicide||178||8|
Table adapted from Andrew Kniss’s “Want to reduce herbicide resistance? Spray more herbicides!” article on weedcontrolfreaks.com
Data from from Hugh Beckie and Xavier Reboud’s 2009 study, “Selecting for Weed Resistance: Herbicide Rotation and Mixture,” published in the Weed Technology journal.
Choose multi-mode herbicides
Your cereal rotation is a great opportunity to introduce new chemistry to control tough and resistant weeds. For control of annual broadleaves, we recommend OUTSHINE™.
OUTSHINE is a multi-mode post-emergent herbicide. It contains three actives (florasulam, fluroxypyr and MCPA ester) and two herbicide groups.
You can’t beat OUTSHINE for control of these relentless weeds:
- Group 2-resistant Cleavers
- Group 2-resistant Kochia
- Volunteer flax
- Wild buckwheat
- Redroot pigweed
Graminicide tank-mix partners
Tank mix OUTSHINE with a graminicide to take out grassy weeds in your cereal crop. Here’s what our area business managers recommend:
OUTSHINE gives you the freedom to grow the most common rotational crops next year, including barley, canola, oats, peas or wheat. You also don’t have to worry about pointless rebates, bundles or programs because ADAMA believes in simple pricing and easy-to-use products. Check out OUTSHINE’s product page for more info.
- “Fighting herbicide-resistance.” Grain News, Apr. 6, 2016.
- “Want to reduce herbicide resistance? Spray more herbicides!” Control Freaks. Oct. 27, 2015.
- Selecting for Weed Resistance: Herbicide Rotation and Mixture , Journal of Weed Technology, 2009.
- OUTSHINE tech sheet
Always read and follow pesticide label directions. Axial and Sierra are registered trademarks of a Syngenta Group Company. Everest is a registered trademark of Arysta LifeScience. Simplicity is a trademark of The Dow Chemical Company.